25491297 has 8 divisors (see below), whose sum is σ = 36602944. Its totient is φ = 15686928.

The previous prime is 25491259. The next prime is 25491311. The reversal of 25491297 is 79219452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25491297 - 2⁶ = 25491233 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 653623 = 25491297 / (2 + 5 + 4 + 9 + 1 + 2 + 9 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25491227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326773 + ... + 326850.

It is an arithmetic number, because the mean of its divisors is an integer number (4575368).

Almost surely, 2^25491297 is an apocalyptic number.

It is an amenable number.

25491297 is a deficient number, since it is larger than the sum of its proper divisors (11111647).

25491297 is a wasteful number, since it uses less digits than its factorization.

25491297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653639.

The product of its digits is 45360, while the sum is 39.

The square root of 25491297 is about 5048.8906702364. The cubic root of 25491297 is about 294.3047767278.

The spelling of 25491297 in words is "twenty-five million, four hundred ninety-one thousand, two hundred ninety-seven".